Gas giants like Jupiter are massive planets held together by their own gravity. Their orbit is determined by the balance between their gravitational attraction to the Sun and the centripetal force that keeps them in motion around it. However, it is highly unlikely for a gas giant like Jupiter to completely lose its orbit under normal circumstances.
In order for a gas giant to lose its orbit, it would require a significant external force acting upon it. This force would need to be strong enough to overcome the gravitational pull of the Sun and disrupt the planet's trajectory. However, such an event is highly improbable and would require a catastrophic occurrence, such as a close encounter with a massive object or a gravitational interaction with another celestial body.
As for meteorites consisting exclusively of gas like Jupiter, such objects do not exist. Jupiter is composed primarily of hydrogen and helium, which are gaseous elements. However, in space, gas does not condense into solid meteorite-like objects. Gas tends to disperse and spread out, rather than clump together into solid masses like rocks or metals.
Meteorites that reach Earth are typically composed of rock, metal, or a combination of both. These materials come from asteroids, which are solid bodies orbiting the Sun. While gas can be present within the composition of some meteorites, it is in the form of trapped gases or tiny gas-filled voids rather than being the dominant component.
In summary, gas giants like Jupiter are unlikely to lose their orbits unless subjected to extreme external forces. Additionally, meteorites do not exist that exclusively consist of gas like Jupiter.